John serdinko



'(No Model.)

J. SERDINKO.

TELEPHONE.

Patented Nov. l3, 1894.

/NVENTOH A TTORNEYS.

T E NORRIS mins co., ma'numm WASNINGTUN u a UNrTED ST TES PATENT GFFTCEO JOHN SERDINKO, OF SAN ANTONIO, TEXAS, ASSIGNOR TO THE NATIONAL UNIONTELEPHONE COMPANY, OF SAME PLACE.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 529,203, dated November 13, 1894, Application filed April 28, 1894:. Serial No. 509.368. (No model.)

thereof, in which- Fgure -1 is a front elevation of a magneto call box to which myimproved telephone has been applied. Fig. 2 is an enlarged horizontal section taken on line 2-2 in Fig. l, with the door of the box closed; and Fig. 3 is a Vertcal transverse section taken on line 3-3 in Fig. 2.

Similar letters of reference indicate correspondngparts in all the views.

The ob ect of my invention is to provide a simple and eEective magneto telephone, in WhlCh the receiving and transmitting instrument will receive its magnetism from the magnets of the magneto call. To this end I have added to such instrument the apparatus herenafter described.

The magneto call box A, is provided with the Inagneto electric generator B, having magnets a and an armature b of well known descrpton. To the inner surface of the-cover C of the magneto call box is Secured a magnetD 5 and the signal bells c are secured to the outer surface of the box cover in the usual way. As the apparatus thus far described is 'well known and incommon use,I do not claim it except in so far as it enters into combina ton with my devices. In the lower portion of the cover C is formed an aperture d, in which is inserted the bobbin e of the transmitting and receiving telephone. The flange of the bobbin extends over the inner surface of the cover C. Against the flange of the bobbn s placed a ring f, and against the ring is placed an iron disk g, to the center of which is secured a tubular soft iron core h, which extends through the bobbin e. In front of the tubular core h is supported an iron diaphragm z, in a cell formed of the rings j, k, l, the cover m and the mouthpiece n.

The iron disk g, when the cover C is closed, lies in close proximity to the field magnets a a, thesaid disk, together with the tubular core h, being magnetized strongly by induction from the magnetsa a. The space behind the diaphra'grn t' and in front of the iron disk g, forms a chamber which is separated from the chamber o by the diaphragm t', and in the sides of the said chamber are inserted flexible tubes p p'. The said tubes terminate in ear pieces E E', the said ear pieces being each provided with a flange q.

To the inside of the cover O is pivoted a double switch arm F, having a central V- shaped notch r, and to the cover are attached i contact springs s s', with either of which the switch lever F may make contact. To the cover C is attached a right angled rod t, upon which the ear piece E is placed when the telephone is not in use. When the telephone is placed on the right angled rod t, the engagement of the flange q with the lever F carries the end of the said lever into contact with the spring s, and when the ear piece is removed from the rod t, the flange q enters the notch 7' in the lever F, and swings 'the said lever so as to disconnect it from the spring s and bring it into contact with the spring s'. The ear piece E', when not in use, is placed on a right angled rod t' projecting fron the bottom of the case of the magneto call.

When the ear piece E is on the support, as shown in Fig. 1, and the lever F is in contact with the spring s, the telephone is cut out of the circuit, and the current from the line wire passes through the binding post u, wire o, hinge w, wire a',1ever F, contact spring s, bell magnet D to the ground connection b'. This circuit is maintained so long as the lever, F, is held supported by the ear-piece, E, as shown in Fig. l, and in such condition the magnetocall will receive or send calls. When, however, the ear piece is removed, the lever F is tilted and its contact with the spring s is broken, and itforms an electrical *contact with the spring s'. Under these conditions the current arriving by the line passes through the binding post u, the wire o, hinge w, wire a' to the lever F as before, thence through the spring s', bobbin of the telephone, thence to the ground connection. The telephone message is spoken into the mouthpiece n, and it is heard through the flexible tubes p and ear pieces E E' of the distant instrument.

Having, thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. In a. telephonie instrument, the combinetion with the nagnets of the magneto-call, the bobbin,and the diaphragn fixed in the front of thelatter, of an iron disk fixed in proxinity to the said magnets, and a core fixed to said disk and extending through the bohbin, into close proxirnity to the diaphragn, as shown and described.

2. In a telephonie instrument, the eombination with the magneto-cali magnets, and the bobbin, and diaphragm, of a soft-iron induetion piece fixed between the said nagnets and diaphragm, a portion of the said piece projectinginto proximity to the diaphragm, as shown and described.

3. i The conbination with the nagn eto transforth.

JOHN SERDINKO. Witnesses:

A. N. CALLAWAY, O. B. Lovn. 

